PHYS 137 FINAL Exam 1&2 questions + Unit 3 worksheets

A lady jiggles the end of a rope, creating a sinusoidal wave that travels away from her hand. If the lady were to quadruple the frequency of her jiggling, the speed of the wave along the rope would _____________ and the wavelength would

If the lady were to quadruple the frequency of her jiggling, the speed of the rope would stay the same, and the wavelength would become fourth as large because if frequency is quadrupled, the wavelength must account for the change, and will become ¼ due to V being constant

A longitudinal wave is traveling upward through the atmosphere. Each chunk of air jiggles ____________ as the wave passes through it.

vertically because longitudal wave= motion parallel to wave direction a

Standing on a pier, an observer of ocean waves notices that 10 peaks pass by during one minute. The frequency of these waves is closest to

0.167 Hz

math: 1/t=f 60/10=6 ——1/6=f=0.167Hz

Your phone emits an 8.0 × 10^8 Hz light wave (which may or may not be visible to the human eye). At any instant, the shortest distance between two peaks of this wave is

v=3.0×10^8 m/s

3.0×10^8/ 8×10^8=0.375 m

When light crosses an interface and enters a medium with a smaller index of refraction, its rays bend _________ the normal to the interface

When a light enters a medium with a smaller N, the rays bend AWAY FROM the normal

When a light enters a medium with a larger N, the rays bend TOWARDS the normal.

Like electric charges (appear to) _______________ each other. Unlike charges (appear to) _______________ each other.

Like charges repel eachother ex: -/-

Unlike charges attract eachother -/+

Three meters away from a point-like negative electric source charge, the electric field is 10,000 N/C in magnitude. At a location six meters from this charge, the magnitude of the electric field is…

2,500 N/C

explanation: E= k [q]/ r².Since the r value is squared. If the distance is halved something becomes four times larger, so the electric field decreases with the square of the distance. If the distance is doubled it becomes ¼ as strong. If the distance is tripled, the field becomes 1/9 as strong, resulting in a magnitude of 1,111.11 N/C.

At a location to the left of a point-like negative electric source charge, the electric field points…

towards the negative charge. TO the right, because the location is to the left of the negative charge, since the field points towards the negative charge it is to the right.

Positive charge: electric field points away
Negative charge: electric field points toward

A proton heading to the right enters a region of space where the electric field points to the right. The resulting electric force on the proton points to the ______________, so the proton will _______________

right, speed up. This is because for a positive charge, the electric force points in THE SAME DIRECTION of the electric field, and it will accelerate as it is moving along the field

Positive charge: force is with the electric field.
Negative charge: force is opposite the electric field.

Joe and Maya are both electrically neutral. However, if Maya steals +3 C of charge from Joe, Joe will obtain an electric charge of ______________ and, as a result, Maya and Joe will ____________ each other

If they are both neutral, and Maya steals +3C, then Joe will have -3C and they will attract

What happens to a positive charge when it moves to a higher voltage?

It gains electric potential energy and loses kinetic energy

What happens to a positive charge when it moves to a lower voltage?

It gains electric potential energy and loses kinetic energy.

What happens to a positive charge when it moves to a lower voltage?

It loses electric potential energy and gains kinetic energy

If electric potential gets higher, what happens to the kinetic energy?

If electric potential gets higher, then the kinetic energy lowers.

A positive charge makes ___ field that ____ it

A positive charge makes ELECTRIC field that POINTS AWAY from it

An electric current makes___field that ____it

An electric current makes MAGNETIC field that RIGHT HANDEDLY CIRCULATES AROUND it.

An electromagnetic ( EM ) wave is best described as a ___ wave

Electromagnetic wave is TRANSVERSE

If I is to the right (→) what is the direction of the magnetic field inside the solenoid?

To the right